LONDON, UK - British Prime Minister Boris Johnson has been admitted to intensive care at St Thomas' Hospital in London after his condition deteriorated.

Mr Johnson had been admitted to the hospital on Sunday, however by early Monday night his condition, which had already worsened prompting his being admitted to the hospital, deteriorated again. At this point he was transferred to an intensive care unit, where seriously ill patients requiring around-the-clock attention are admitted. This was around 6:00pm Monday night local time.

Over the course of this afternoon, the condition of the Prime Minister has worsened and, on the advice of his medical team, he has been moved to the Intensive Care Unit at the hospital, a spokesman for his office at No 10 Downing Street said Monday night.

The PM has asked Foreign Secretary Dominic Raab, who is the First Secretary of State, to deputize for him where necessary. The PM remains conscious at this time, the statement said.

The governments business will continue, Dominic Raab later told a press conference.

The prime minister is in safe hands and the focus of the government will continue to be on making sure that the prime ministers direction, all the plans for making sure that we can defeat coronavirus and can pull the country through this challenge, will be taken forward.

There was other support from overseas and from home. My thoughts and prayers are with Boris Johnson and his family as he continues to receive treatment in hospital, former prime minister Theresa May said in a statement.

"I want to express our nations well wishes to Prime Minister Boris Johnson as he wages his own personal fight with the virus," U.S. President Donald Trump told his nightly coronavirus briefing."All Americans are praying for him. Hes a friend of mine.Hes a great gentleman and a great leader.And hes as you know, he was brought to the hospital today, but Im hopeful and sure that hes going to be fine.Hes a strong man, a strong person."

I send all my support to Boris Johnson, to his family and to the British people at this difficult moment, French President Emmanuel Macron said Monday night. I wish him a speedy recovery at this testing time.

The news of Johnson's hospitalisation came on the same day as Queen Elizabeth II's rare televised message to the UK during coronavirus pandemic urging Keir Starmer, the newly elected Labour Party leader, who was among those who conveyed their best wishes to Johnson. "Wishing the prime minister well and a speedy recovery," Startmer tweeted.

As of Monday, the UK has reported 5,373 deaths and 51,608 people had tested positive for the virus. Astonishingly, the UK's Health Secretary Matt Hancock also tested positive on the same day as Johnson, but he has since recovered.